6.9.20991.6893_Release guest page doesn't work with IE.

I've sen the notes about the Host page being deprecated on IE, but as of 6.9, the Guest page no longer works for our on-prem install.  It just draws the top bar, no text, nothing further.

This happened with the pre-releases as well.  I've disabled all extensions, no change.  I've also tried several other themes.  (We're using DarkWithBlue).  Multiple workstations inside and outside our network.

Other browsers all seem okay.